It is often made using a bread such as a baguette or Italian bread: Bread is sliced towards the bottom, but kept in one piece. Afterwards, melted butter and garlic (or garlic powder) is spread between the slices. The bread is then baked in an oven. Alternatively, the bread can be cut into individual slices and covered with the butter individually.
A modern variation on the recipe tops the garlic bread with a variety of cheeses, often mozzarella, cheddar or feta. A light layer of freshly-grated parmesan on top of the mozzarella adds an extra boost of flavour. Mexican-style variations often include topping the garlic bread with cheese, salsa and chili peppers.
Frozen garlic bread was developed in the 1970s by Cole's Quality Foods in Michigan.